Pseudomonas piscicida ATCC 15057 and the antiyeast variant designated AEB-O both developed in a medium of ammonium salts, citrate and inorganic phosphate, and showed comparable growth response in a basal medium of arginine and artificial sea water supplemented with either various
phosphorylated organic compounds or inorganic phosphate. The two morphologically and physiologically similar bacteria also exhibit ichthyotoxicity and are distinguished only on the basis of the specific antiyeast properties of the variant. Some ecological aspects of pseudomonads in the marine
environment, particularly in relation to fish mortalities are discussed, based on nutritional response and other characteristics of the organisms.
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